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GR127935 acts as a partial agonist at recombinant human 5-HT1D alpha and 5-HT1D beta receptors.

Abstract：

:In this study we have investigated the functional activity of GR127935 (2-methyl-1,2,4 oxadiazol-3-yl)-biphenyl-[4-carboxylic acid 4-methoxy-3-(4-methyl-piperazine-1-yl]-amide) at human 5-HT1D alpha and 5-HT1D beta receptors which have been expressed in a Chinese Hamster Ovary (CHO) cell line. Using [35S] GTP gamma S binding to cell membranes as a measure of receptor-G protein coupling. GR127935 showed partial agonist activity in both 5-HT1D alpha and 5-HT1D beta receptor expressing cells (Emax: 29 and 31% above basal control; pEC50: 8.6 and 9.7, respectively). GR127935 also acted as a potent antagonist at the 5-HT1D alpha (app. pA2 8.5) and 5-HT1D beta (app. pA2 9.1) receptors. From studies measuring cAMP accumulation in cultured CHO cells GR127935 also displayed partial agonism, as well as acting as a potent antagonist at the 5-HT1D alpha receptors which stimulate cAMP levels and 5-HT1D beta receptors which inhibit cAMP levels (app. pA2 8.6 and 9.7, respectively). The 5\-HT1-like receptor antagonist methiothepin showed negative intrinsic activity at both receptors in the [35S]GTP gamma S binding assay only. From studies using the receptor alkylating agent EEDQ (N-ethoxycarbonyl-2-ethoxy-1,2-dihydroquinoline) the 5-HT1D alpha cell line displayed a lack of receptor reserve but it was evident in the 5-HT1D beta cell line. In previous studies we have also shown that agonist stimulation of 5-HT1D alpha receptors increases cAMP levels which may be due to high receptor expression. Further investigation using up to 1 microM EEDQ to reduce 5-HT1D alpha receptor number did not reveal an underlying inhibitory adenylyl cyclase response. In conclusion, GR127935 acts as a partial agonist, as well as a potent antagonist, at the human 5-HT1D alpha and 5-HT1D beta receptors when expressed in CHO cells.

journal_name

Eur J Pharmacol

journal_title

European journal of pharmacology

authors

Watson JM,Burton MJ,Price GW,Jones BJ,Middlemiss DN

doi

10.1016/s0014-2999(96)00579-1

subject

Has Abstract

pub_date

1996-10-31 00:00:00

pages

365-72

issue

eissn

0014-2999

issn

1879-0712

pii

S0014299996005791

journal_volume

314

pub_type

杂志文章

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GR127935 acts as a partial agonist at recombinant human 5-HT1D alpha and 5-HT1D beta receptors.